Petrology, Geochemistry, and Tectonic Significance of the Gabbroic Rocks from Cheshmeh Derazeh, Northern Harsin, within the Kermanshah Ophiolitic Complex, Iran

Document Type : Original Article

Authors

1 Department of Geology, Faculty of Science, Payame Noor University, Tehran, Iran

2 Department of Geology, Faculty of Science, Tarbiat Modares University, Tehran, Iran

Abstract

The gabbroic rocks of Cheshmeh Derazeh, located north of Harsin, are part of the Kermanshah ophiolitic complex. These rocks occur in both layered and massive forms and are primarily composed of olivine, pyroxene, and plagioclase, with minor amounts of amphibole, and accessory minerals such as zircon and apatite. The dominant textures observed in these rocks include granular, porphyritic, and intergranular. Geochemical analyses indicate that the rocks belong to a magnesium-rich tholeiitic to transitional magma series. The normalized multi-element patterns relative to N-MORB show enrichment in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs), along with depletion in high field strength elements (HFSEs; Nb, Ta, Ti). Trace element modeling suggests that the parental magma was derived from partial melting of a metasomatized lithospheric mantle source within the spinel stability field. Whole-rock geochemical characteristics indicate that these magmas were low-Ti island arc tholeiites, formed in a subduction-related setting during the closure of the Neotethys Ocean in the Late Cretaceous.



 

Keywords


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